mirror of https://github.com/xemu-project/xemu.git
98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/*
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* Offscreen OpenGL abstraction layer
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*
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* Copyright (c) 2010 Intel
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* Written by:
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* Gordon Williams <gordon.williams@collabora.co.uk>
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* Ian Molton <ian.molton@collabora.co.uk>
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* Copyright (c) 2013 Wayo
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef GLOFFSCREEN_H_
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#define GLOFFSCREEN_H_
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#include <stdbool.h>
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#ifdef __APPLE__
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#include <OpenGL/gl.h>
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#elif defined(_WIN32)
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#include <GL/glew.h>
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#include <GL/gl.h>
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#include <GL/glext.h>
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#else
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#include <GL/gl.h>
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#endif
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/* Used to hold data for the OpenGL context */
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struct _GloContext;
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typedef struct _GloContext GloContext;
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/* Format flags for glo_surface_create */
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#define GLO_FF_ALPHA_MASK (0x0001)
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#define GLO_FF_NOALPHA (0x0000)
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#define GLO_FF_ALPHA (0x0001)
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#define GLO_FF_BITS_MASK (0x00F0)
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#define GLO_FF_BITS_16 (0x0020)
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#define GLO_FF_BITS_24 (0x0030)
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#define GLO_FF_BITS_32 (0x0040)
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#define GLO_FF_DEPTH_MASK (0x0F00)
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#define GLO_FF_DEPTH_16 (0x0100)
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#define GLO_FF_DEPTH_24 (0x0200)
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#define GLO_FF_DEPTH_32 (0x0300)
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#define GLO_FF_STENCIL_MASK (0xF000)
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#define GLO_FF_STENCIL_8 (0x1000)
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/* The only currently supported format */
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#define GLO_FF_DEFAULT (GLO_FF_BITS_24|GLO_FF_DEPTH_24)
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/* Change current context */
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void glo_set_current(GloContext *context);
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/* Check GL Extensions */
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bool glo_check_extension(const char* ext_name);
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void* glo_get_extension_proc(const char* extProc);
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/* Create an OpenGL context for a certain
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* pixel format. formatflags are from the
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* GLO_ constants */
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GloContext *glo_context_create(int formatFlags);
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/* Destroy a previouslu created OpenGL context */
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void glo_context_destroy(GloContext *context);
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/* Functions to decode the format flags */
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int glo_flags_get_depth_bits(int formatFlags);
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int glo_flags_get_stencil_bits(int formatFlags);
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void glo_flags_get_rgba_bits(int formatFlags, int *rgba);
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int glo_flags_get_bytes_per_pixel(int formatFlags);
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/* Score how close the given format flags match. 0=great, >0 not so great */
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int glo_flags_score(int formatFlagsExpected, int formatFlagsReal);
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/* Note that this is top-down, not bottom-up as glReadPixels would do. */
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void glo_readpixels(GLenum gl_format, GLenum gl_type,
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unsigned int bytes_per_pixel, unsigned int stride,
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unsigned int width, unsigned int height, void *data);
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#endif /* GLOFFSCREEN_H_ */
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